We should extract the downloaded .cab file(s) to a location accessable by SCCM e.g. C:\Sources\Drivers\Dell

We can now import the cab file(s) into SCCM from Configuration Manager Console >> Software Library >> Operating Systems >> Right-hand click 'Drivers' >> Import Drivers and specify the folder where we copied the .cab contents.

Make sure "Import the driver and append a new category to the existing categories" is selected >> Next >> and ensure "Enable these drivers and allow computers to install them" is ticked >> Next >> New Package... >> Enter a name for the new driver package and select a location where it's contents (and future additions) will be stored e.g.:

C:\Sources\Drivers Packages\Dell

Make sure "Update distribuion points when finished" is ticked >> Next >> Add them to any boot images if nescasery >> Next >> Next >> SCCM should then begin to import the drivers.

Finally right-hand click on the new driver package and select "Distribute" and select which Distribuion Points you wish to publish it to.